📐
Natural Numbers
★☆☆☆☆Elementary
📖Definition
Positive integers used for counting: 1, 2, 3, 4, ...
📐Formulas
ℕ = 1, 2, 3, 4, 5, ...
Set notation for natural numbers
✏️Examples
예제 1★☆☆☆☆
Select all natural numbers: -3, 0, 5, 2.5, 100
예제 2★★☆☆☆
Find the sum of natural numbers from 1 to 10.
∑_k=1¹⁰ k = (10 × 11)/(2) = 55
⚡Applications
Daily life
Counting objects
Computing
Array indices, loop counts
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⚡Applications
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